1155749109 has 8 divisors (see below), whose sum is σ = 1543699872. Its totient is φ = 769148880.

The previous prime is 1155749087. The next prime is 1155749113. The reversal of 1155749109 is 9019475511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155749109 - 2⁷ = 1155748981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155749009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335634 + ... + 339059.

It is an arithmetic number, because the mean of its divisors is an integer number (192962484).

Almost surely, 2^1155749109 is an apocalyptic number.

It is an amenable number.

1155749109 is a deficient number, since it is larger than the sum of its proper divisors (387950763).

1155749109 is an equidigital number, since it uses as much as digits as its factorization.

1155749109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675267.

The product of its (nonzero) digits is 56700, while the sum is 42.

The square root of 1155749109 is about 33996.3102262584. The cubic root of 1155749109 is about 1049.4325305562.

The spelling of 1155749109 in words is "one billion, one hundred fifty-five million, seven hundred forty-nine thousand, one hundred nine".